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Use any synthetic that you like and add gm eos one pint per oil change. Your zddp will be right on the money. Synthetic oil does not cause oil leaks, leaking gaskets and seals cause oil leaks. I have changed over a half dozen high mile 911s to synthetics and never had one leak attributed to synthetic oil, also you dont have to worry about changing sooner, yo will have all the zddp you need. If you dont want to mix use 20/50 mobil one for 4 stroke motorcycles and you will have the same thing. The "dont use synthetics" message went away with the dinosaurs, except for a few, JL
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1987 911 Cab TRE engine  1952 356A sold  ,1960 356B totaled hit by drunk totaled  1979 911 sc Targa sold,1984 911 3.2 Targa sold,1985 911 3.2 Coupe sold 1987 3.2 coupe sold to my son PARTS ENDLESS WORK $$$$$ PREPARING and driving your PORSCHE anywhere with confidence PRICELESS!!
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